Sex drive

I'm 28 and overweight, my DH(23) and I have been TTC for 3 years. He has low sperm count which has hendered our chances. The docs said there was a chance it could happen naturally but we'd probably need AI. But on to my question I have absoulty no sex drive. My poor DH might get it once maybe twice a month. I don't know what to do. We have sexy games, toys, & movies but I'm stuck in a rut. Any help ladies, go see a doc or wait to see if it's just a phase?